Saw-set.



Patented July I6, I901.

C. L. DBIEFEB. SAW SET (Application filed Jan. 22, 1901.)

(No Model.)

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lJlTED Stern's ATENT rricnt CONRAD L. DRIEFER, OF SAN FRANCISCO, CALIFORNIA.

SAW- S ET.

SPECIFICATIQN forming part of Letters Patent No. 678,648, dated July 16, 1901.

Application filed January 22 1901. Serial No- M SOS. (No model.)

,To 6255 whom it may concern:

Be it known that I, CONRAD L. DRIEFER, a citizen of the United States, residing at 828 Minnesota street, San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Saw-Sets; and I do hereby declare the following to be a full, clear, and exact description of said invention, such as will enable others skilled in the art to which it most nearly appertains to make, use, and practice the same.

This invention relates to improvements in saw-sets, and particularly to saw-sets capable of setting a plurality of teeth with one action.

The object sought to be accomplished is to provide means for setting alternate teeth of the saw in opposite directions with one action, so that the pressure on each tooth may be equal and a perfect offset of the saw-teeth resuit.

In the drawings, Figure 1 is a side elevation of a saw-set constructed in accordance with this invention, the circular-saw gage attachment being in dotted construction. Fig. 2 is a similar view in front end elevation. Fig. 3 is a plan view from above of the bed of the saw-set below the line X X, Fig. 1, showing the plungers in operative position. Fig. 4: is a side elevation of Fig. 8, the parts being cut away on the line X X, Fig. 3. Fig. 5 is an end of one of the plungers in its guide. Fig. 6 is a diagrammatic end elevation showing the circular-saw guide in position on the periphery of a circular saw.

In the description with reference to the accompanying drawings the primary groups of mechanisms will be distinguished by a letter, the secondary mechanisms of these groups being distinguished by the common letter strengthened by the addition of a numeral.

The handle-lever mechanism will be designated by the letter A, the bed mechanisms by the letter B, the gaging mechanisms by the letter O, the spacing mechanism by the letter D, the circular-saw gage by the letter E, and the saw-blade by the letter F.

In construction the saw-set consists of two oppositelyacting lever-handles A A, ful-, crumed on the pin B. To control the throw of these handles, the stop-screw A is threaded through one handle for the other handle to butt against, the lock-n'ut A being provided to maintain the adjustment of the screw A. The spring A set between the handles, maintains them in open-position. The ends of the handles extending into the bed B are provided with the plates A, screwed thereto.

The bed B consists of a box-like structure suspended from the pin B by the extensions or links B and the bed-plate B is divided and inserted into the grooves 13 provided in the frame of the bed. The bed-plate is made separate to facilitate the forming of the trans verse channels B in which the plungerguides B are secured bythe wing-screws B threaded into their bottoms and operating in the slots B The bed B is divided Vertically by the throat 13*, into which the saw-blade F is inserted.

The spacing-gage consists of the stud-bolt 0, extending from the bed on the right-hand side, the gage-disk 0 being threaded onto the bolt G and locked in the desired position by the lock-nut C The space-counting gage consists of the lever D, fulcrumed in the attaching-lug D screwed to the standard B on the left-hand side of the bed. Hinged to the member D is the pawl D and the gage-screw D is provided above the fulcrum of the member D to butt against the head of the pin B.

The setting mechanisms consist of two oppositely-acting plungers B rectangular in shape, sliding within guides 13". The faces 13 of the plungers B are formed to impart the proper offset to the saw-teeth F, the rear end of the plungers being provided with the recess 13 into which the plates A extend.

The circular-saw gage E consists of a yoke member E, straddling the bed B, pivoted between the lugs E on the plate E secured to the bed-plate by the wing-screw E The member E is regulated with reference to the periphery of the circular saw by the screw E threaded in its head E andbutting against the plate E Having thus described the construction, the operation is as follows: The saw-set is placed with the throat B straddling the saw-blade F, the gage 0 being upon the right-hand side, the spacer D being in the position shown in Fig. 2, (the pawl D resting in the throat of a saw-tooth.) The gage-disk (J is adjusted to also rest in the throat of a saw-tooth and locked in position by the lock-nut G The plungers B are now adjusted (see Fig. 3) so that two teeth F are brought into line with the faces B, the plungers being now locked in this position by the wing-screws B", the channels B serving to keep the plungerguides in line. The plates A are sufficiently wide to permit the adjustment of the plungers laterally without disengagement. The curve of the saw-teeth is regulated by limiting the throw of the handles A by setting the screw A to the desired pitch. Compression of the handles A advances the pliingers B imparting the proper offset to two of the teeth F. Having completed one action, the whole mechanism of the saw-set is advanced the two succeeding saw-teeth by throwing the head of the member D forward until the regulating-screw D (previously set) butts against the head of the pin B, the pawl D following up the mechanism, when the member D is released and returned to normal position by the spring D the head of which is secured under the head of the attaching-screw D of the lugs D The spring D may be dispensed with, but assists the action of the pawl D To support the mechanism when the last tooth of the saw is reached, the extension B Fig. 3, on the bed is provided. The reason for this is obvious.

In handling circular saws were the depth of the throat B alone depended upon the arc of the saw would throw the teeth above the line of the plungers. To regulate this, the attachment E. is set so that the head E of the yoke member E rests upon the periphery of the saw, the blade-guide E resting in the throat of a tooth, (see Fig. 6,) the depth of the throat B being thus regulated by the screw E It is obvious that the saw-teeth may beset at irregular intervals, as is desirable in some classes of hack-saws. In an experienced or steadyhand the spacing mechanism D could be dispensed with. Certain mechanical changes, such as a micrometric adjustment of the guides B by extending a screw from the side of the bed B with swivel attachment to the guide 15", maybe made. Further, this invention does away with the necessity of the usual anvil in saw-sets-in itself a substantial improvement. However, should an anvil be desired it could easily be made a separate attachment and be applied in front of the plunger. It is also obvious that the invention is equally advantageous in straightening the teeth-in fact, by using this invention the same teeth may be repeatedly set, straightened, and reset in the opposite direction without the least injury to the teeth. The teeth being set on a curve are much stronger than when bent at an angle by the impact of a hammer or the use of an anvil.

Having thus described this invention, what is claimed is- 1. In a saw-set or the like, an open-bottom bed member having grooves in its inner side walls, bed-plates fitting in said grooves and having a throat left between their inner ends, and upsetting members carried by said bedplates; substantially as described.

2. In a saw-set or the like, a pair of handles pivoted upon a fulcrum-pin, links upon said fulcrum-pin, a bed suspended by said links, plungers carried by said bed, and connection between said plungers and corresponding ends of said handles whereby said plungers are operated by the movement of said handles; substantially as described.

3. In a saw-set or the like, a bed, a plunger slidable thereon, said plunger having a recess near its outer end, an operating-lever engaging the outer end 01 said plunger, and a plate upon said lever engaging said recess; substantially as described.

4. In a saw-set or the like, a pair of handles, a fulcrum-pin upon which said handles are pivoted, links upon said pin, a bed suspended by said links, setting members carried by said bed and having operative connection with the ends of the handles, and spacing mechanism supported by one of said links; substantially as described.

5. In a saw-set or the like, a pair of handles, a fulcrum-pin upon which said handles are pivoted, links upon said pin, a bed suspended by said links, setting members carried by said bed and having operative con nection with the ends of the handles, a lug upon one of said links, a lever pivoted to said lug, a. pawl upon said lever below its pivot, and a set-screw extending through said lever above its pivot; substantially as described.

In testimony whereof I have hereunto set my hand this 12th day of January, 1901.

CONRAD L. DRIEFER.

Witnesses:

GEO. F. HATTON, BALDWIN VALE. 

